I don't know about the HB available Onix power cable, but what I have used for wiring directly to the battery, and this has worked really well for me, is a 12 gauge 10' - 25' extension cord from the local Walmart. I just cut the ends off of it and strip two of the leads for my battery terminals. This will give you 3 - 12 gauge stranded conductors in a single jacket which makes it really easy to pull and the 3rd conductor gives you a spare if you ever need it.